Firearm barrel nut



FIG. 1 is an isometric view of an embodiment of my firearm barrel nut illustrating an ornamental hole pattern; and,

FIG. 2 is a side view of the firearm barrel nut and the ornamental hole pattern shown in FIG. 1.

The broken lines are included for the purpose of illustrating the environment and form no part of the claimed design. 

CLAIM The ornamental design for a firearm barrel nut, as shown and described. 